APC 990-1587 user manual Battery Operation, Affect the voltage display

FEATURE	FUNCTION
Self-Test	Automatic: The UPS performs a self-test automatically when turned on, and
	every two weeks thereafter (by default). During the self-test, the UPS briefly
	operates the connected equipment on battery.
	Manual: Press and hold the		button for a few seconds to initiate the self-
	test.
Cold Start	120V and 230V models only: Supply battery power to the UPS and connected
	equipment in the absence of utility voltage (see Troubleshooting). Press the
	button for one second and release. The UPS will beep briefly and go quiet. Press
	and hold the button again, but for approximately three seconds. The unit will
	emit a sustained beep. Release the button during this beep.
Diagnostic Utility	The UPS has a diagnostic feature that displays the utility voltage.
Voltage	The UPS starts a self-test as part of this procedure. The self-test does not
	affect the voltage display.
	Press and hold the	button to view the utility voltage bar graph display.
	After a few seconds, this five-LED battery charge			display on the right of
	the front panel will show the utility input voltage.
	Refer to the figure at left for the voltage reading (values are not listed on the
	UPS).
	The display indicates the voltage is between the displayed value on the list and
	the next higher value (see Troubleshooting).

Battery Operation

The UPS switches to battery operation automatically if the utility power fails. While running on bat- tery, an alarm beeps four times every 30 seconds.

Press the button to silence this alarm. If the utility power does not return, the UPS continues to supply power to the connected equipment until the battery is fully discharged.

If PowerChute is not being used, files must be manually saved and the computer must be turned off before the UPS fully discharges the battery.

Refer to www.apc.com for on battery runtimes.

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